Funding for this research was provided by:
VOCO® GmbH, Cuxhaven, Germany
DENTAURUM GmbH & Co. KG, Ispringen, Germany
Received: 2 March 2020
Accepted: 1 September 2020
First Online: 5 September 2020
Ethics approval and consent to participate
: This article does not report on any studies with human participants or animals that were performed by any of the authors.
: Not applicable.
: The authors declare that they have no competing interests.